#pragma once
#include<bits/stdc++.h>
namespace wc {
	template<class T>
	struct less {
		bool operator()(const T& x, const T& y) {
			return x < y;
		}
	};
	template<class T>
	struct da {
		bool operator()(const T& x, const T& y) {
			return x > y;
		}
	};
	template<class T,class Container = vector<T>,class Compare=less<T>>
	class priority_queue {
	public:
		Compare com;
		void adjust_up(int child) {
			int parent = (child - 1) / 2;
			while (child > 0) {
				if (com(_con[child],_con[parent])) {
					swap(_con[child], _con[parent]);
					child = parent;
					parent = (child - 1) / 2;
				}
				else {
					break;
				}
			}
		}
		void adjust_down(int parent) {
			int child = parent * 2 + 1;
			while (child < _con.size()) {
				if (child+1<_con.size() && com(_con[child + 1],_con[child]))child++;
				if (com(_con[parent],_con[child] )) {
					swap(_con[child], _con[parent]);
					parent  = child ;
					child = parent * 2 + 1;
				}
				else {
					break;
				}
			}
		}
		void push(const T& x) {
			_con.push_back(x);
			adjust_up(_con.size()-1);
		} 
		void pop() {
			swap(_con[0], _con[_con.size() - 1]);
			_con.pop_back();
			adjust_down(0);
		}
		const T& top() {
			return _con[0];
		}
		size_t size() {
			return _con.size();
		}
		bool empty() {
			return _con.empty();
		}
	private:
		Container _con;
	};
}